Garage wiring

[craigsuds9]

Am looking on wiring 2 sockets and a light in my garage. I have run a 4mm t+e cable from a 20 amp breaker in the consumer unit to a 4 way enclosure in the garage where I have a 40 amp double pole rcd, a 16 amp breaker and a 6 amp breaker. Is this acceptable? I am not long in the sparkie business and have not done a lot of domestic work!

 

[Hawk81]

Is the 4mm RCD protected?

 

[i=p/u]

does it need to be if a distribution circuit

 

[Hawk81]

Depends on the way it is installed. Plus if it is then there is no need to have an RCD in the garage.

 

[i=p/u]

yes but as you well know, it is better if fault protection is in garage,
and now i get what you mean about installed
>50mm or surface mounted etc

was about to say i know more than you, hah

 

[Hawk81]

Its not that its better its just less inconvieniant to reset if the rcd is in the garage.

 

[i=p/u]

not really if the power being used is in the garage.. you on the vino

 

[Hawk81]

Read what I wrote again. I think you are on the vino! Lol

 

[Electricalserv]

Best to have rcd in garage as if fault exists in garage only garage circuit becomes out of use. Not sure if I'd have a 20 amp mcb protecting 16amp and 6amp. And your 4mm twin and earth depends how you have protected it etc

 

[craigsuds9]

Thanks for your posts. Would you have a bigger breaker supplying the garage, ie a 32amp breaker?

 

[Electricalserv]

Yeh 32 amp. I know you will have diversity and lights will never ever reach 6amp but your 2 Mcb's in garage maximum demand is 22amp. If installation ever got added to an 32 amp would be perfect.

 

[Hawk81]

Thanks for your posts. Would you have a bigger breaker supplying the garage, ie a 32amp breaker?

Depends on length of run and installion method. This will determine if your 4mm will be ok on a 32Amp mcb

 

[Hawk81]

He is right!

Who is?

 

[telectrix]

Think he means you, hawk